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909af1a43b
Change multi's book keeping of transfers to no longer use lists, but a special table and bitsets for unsigned int values. `multi-xfers` is the `uint_tbl` where `multi_add_handle()` inserts a new transfer which assigns it a unique identifier `mid`. Use bitsets to keep track of transfers that are in state "process" or "pending" or "msgsent". Use sparse bitsets to replace `conn->easyq` and event handlings tracking of transfers per socket. Instead of pointers, keep the mids involved. Provide base data structures and document them in docs/internal: * `uint_tbl`: a table of transfers with `mid` as lookup key, handing out a mid for adds between 0 - capacity. * `uint_bset`: a bitset keeping unsigned ints from 0 - capacity. * `uint_spbset`: a sparse bitset for keeping a small number of unsigned int values * `uint_hash`: for associating `mid`s with a pointer. This makes the `mid` the recommended way to refer to transfers inside the same multi without risk of running into a UAF. Modifying table and bitsets is safe while iterating over them. Overall memory requirements are lower as with the double linked list apprach. Closes #16761
93 lines
3 KiB
C
93 lines
3 KiB
C
#ifndef HEADER_CURL_HASH_OFFT_H
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#define HEADER_CURL_HASH_OFFT_H
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/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at https://curl.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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* SPDX-License-Identifier: curl
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*
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***************************************************************************/
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#include "curl_setup.h"
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#include <stddef.h>
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#include "llist.h"
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struct Curl_hash_offt_entry;
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typedef void Curl_hash_offt_dtor(curl_off_t id, void *value);
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/* Hash for `curl_off_t` as key */
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struct Curl_hash_offt {
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struct Curl_hash_offt_entry **table;
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Curl_hash_offt_dtor *dtor;
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size_t slots;
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size_t size;
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#ifdef DEBUGBUILD
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int init;
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#endif
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};
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void Curl_hash_offt_init(struct Curl_hash_offt *h,
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size_t slots,
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Curl_hash_offt_dtor *dtor);
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void Curl_hash_offt_destroy(struct Curl_hash_offt *h);
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bool Curl_hash_offt_set(struct Curl_hash_offt *h, curl_off_t id, void *value);
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bool Curl_hash_offt_remove(struct Curl_hash_offt *h, curl_off_t id);
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void *Curl_hash_offt_get(struct Curl_hash_offt *h, curl_off_t id);
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void Curl_hash_offt_clear(struct Curl_hash_offt *h);
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size_t Curl_hash_offt_count(struct Curl_hash_offt *h);
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/* A version with unsigned int as key */
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typedef void Curl_uint_hash_dtor(unsigned int id, void *value);
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struct uint_hash_entry;
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/* Hash for `unsigned int` as key */
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struct uint_hash {
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struct uint_hash_entry **table;
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Curl_uint_hash_dtor *dtor;
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unsigned int slots;
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unsigned int size;
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#ifdef DEBUGBUILD
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int init;
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#endif
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};
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void Curl_uint_hash_init(struct uint_hash *h,
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unsigned int slots,
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Curl_uint_hash_dtor *dtor);
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void Curl_uint_hash_destroy(struct uint_hash *h);
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bool Curl_uint_hash_set(struct uint_hash *h, unsigned int id, void *value);
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bool Curl_uint_hash_remove(struct uint_hash *h, unsigned int id);
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void *Curl_uint_hash_get(struct uint_hash *h, unsigned int id);
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unsigned int Curl_uint_hash_count(struct uint_hash *h);
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typedef bool Curl_uint_hash_visit_cb(unsigned int id, void *value,
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void *user_data);
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void Curl_uint_hash_visit(struct uint_hash *h,
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Curl_uint_hash_visit_cb *cb,
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void *user_data);
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#endif /* HEADER_CURL_HASH_OFFT_H */
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